Dan Laffoley, marine vice chairman of the World Commission of Protected Areas at the International Union for Conservation of Nature (IUCN), has an excellent op-ed published on 26 December 2009 in the New York Times titled: To Save the Planet, Save the Seas.
He argues for a program similar to Reducing Emissions From Deforestation and Forest Degradation (REDD) (under which developing countries would be compensated for preserving forests, peat soils, swamps and fields that are efficient absorbers for carbon dioxide) for the world’s oceans.
Few people may realize it, but in addition to producing most of the oxygen we breathe, the ocean absorbs some 25 percent of current annual carbon dioxide emissions. Half the world’s carbon stocks are held in plankton, mangroves, salt marshes and other marine life. So it is at least as important to preserve this ocean life as it is to preserve forests, to secure its role in helping us adapt to and mitigate climate change.
Laffoley writes that the most efficient natural carbon sink is found not on land but in the ocean – a species of sea grass called the Posidonia oceanica, which forms vast “meadows” underwater.
Worldwide, coastal habitats like these are being lost because of human activity. Extensive areas have been altered by land reclamation and fish farming, while coastal pollution and overfishing have further damaged habitats and reduced the variety of species. It is now clear that such degradation has not only affected the livelihoods and well-being of more than two billion people dependent on coastal ecosystems for food, it has also reduced the capacity of these ecosystems to store carbon.
Coastal and marine habitats such as salt marshes, kelp forests and sea grass meadows should be protected and restored to mitigate climate change.
Managing these habitats is far less expensive than trying to shore up coastlines after the damage has been done. Maintaining healthy stands of mangroves in Asia through careful management, for example, has proved to cost only one-seventh of what it would cost to erect manmade coastal defenses against storms, waves and tidal surges.